The NYT says: It’s not a pipeline problem. It’s about loneliness, competition, and deeply rooted barriers.

The impact of gender is hard to pin down decisively. But after years of biting their tongues, believing their ranks would swell if they simply worked hard, many senior women in business are concluding that the barriers are more deeply rooted and persistent than they wanted to believe.

Google launched Project Aristotle to discover the perfect mixture of skills, backgrounds, and traits that produce successful teams. After conducting 200-plus interviews, they pinpointed the following key characteristics: